I’m good with Garret. It seems the most logical so far and (was it) Whelan? laid it out pretty well. Just as it seems there’s no way, no how, it cold be Timmy’s or could have happened on Jul 1.
Finally, something sunk in about the Garret’s staircase. Unless a wall was removed, it can’t have been that house. There’s an open bannister to the landing and it seems to continue all the way up. No one could “ping-pong” off the walls with only one wall. Again, this all assumes that something happened.